The answer to 'skylight sagging' is that a sagging skylight is often caused by structural issues with the roof or improper installation. Symptoms include the skylight frame sinking or the glass/panel becoming uneven. Solutions can range from reinforcing the roof framing to completely replacing the skylight.
Skylight sagging is usually a sign of larger roof problems that require professional inspection and repair. While minor adjustments may be possible for DIY homeowners, significant sagging or structural issues should be addressed by a licensed roofing contractor to ensure safety and prevent further damage.